04-26-2017
Sometime in the 90's, I made a microphone oscilloscope which operated in DOS 80x25 text mode at 128x128 resolution. It updated the display by changing the font every single frame. This made it fast and flicker-free. I could do 128x256, which was less oddly shaped, but suffered graphical artifacts because of characters the video card blithely assumed were "line drawing" characters which it should extend to meet the neighboring character.
Oscilloscope was the best I could do. I struggled with it for a long time but never managed to port a working FFT algorithm from anywhere. There weren't widely available libraries back then.
Everything was done in Borland Turbo C for DOS, an IDE which students across the globe still use to this day for learning purposes.
Last edited by Corona688; 04-26-2017 at 05:07 PM..
10 More Discussions You Might Find Interesting
1. IP Networking
Hi people... Is there any way to configure the conection i text mode ? I need to know how to make the modem work and how to configure a dial up conection in text mode by redhat 7.1 and if possible how to configure the email...
I use the workstation installation...any help will be welcome...... (2 Replies)
Discussion started by: furioso
2 Replies
2. UNIX for Advanced & Expert Users
Hi.
I need to run old full-screen text-mode application under X-Windows. (By the way it is touch-screen calibrator firmware). The screen resolution is to be 1280x1024 exactly. The program expect text-mode geometry 80x25. Running xterm (no window manager) I have adjusted the font pararameters to... (3 Replies)
Discussion started by: shestero
3 Replies
3. AIX
Can I know is there anyone know how to statup AIX in GUI and text mode?
Thank You..... (2 Replies)
Discussion started by: dwarf007
2 Replies
4. UNIX for Dummies Questions & Answers
hello all
I saw somewhere there is some kind of version of emacs in full text mode ?
how can I get/download it? if I have ordenry emacs installed can I start it in text mode?
thanks (2 Replies)
Discussion started by: umen
2 Replies
5. Solaris
Hi all
I have installed solaris 5.10 and it is loading in GUI mode by default.
I want to load in text mode by default. How to do this? How to switch from GUI to text mode and vise versa.?
Please help.. (2 Replies)
Discussion started by: johnl
2 Replies
6. SuSE
Hi All,
I used to have my suse linux(VM) server in graphic mode but not anymore since morning. I cant rolback since i loose somuch work. Any idea how to it back to normal. Thanks (6 Replies)
Discussion started by: s_linux
6 Replies
7. Red Hat
Hello everyone
Had a problem booting Fedora. I installed it as a server without any desktop environment(kde, gnome) except for X. Problem is when i booting system after it loads kernel suddenly screen messes up with parts of fedora graphics(it's not clear but you can see it -... (8 Replies)
Discussion started by: dimamu15
8 Replies
8. Hardware
Dear All,
i am trying to install the redhat linux using graphical mode...but it stucks while probing video card...i have installed linux using text mode it works fine and whole the installation goes fine. after installation if i give startx command it again stucks....looks like a vga card... (9 Replies)
Discussion started by: zaheer.gr8
9 Replies
9. UNIX for Dummies Questions & Answers
This is a DEMO only...
Someone recently asked about creating a box to make something look nicer on screen.
I suggested that with careful colouring a 3D effect could be created...
Linux version; this also works on a Macbook Pro but is not as easy to see as the other code below:-
... (0 Replies)
Discussion started by: wisecracker
0 Replies
10. OS X (Apple)
Hi guys...
Finally decided to release this, I have a python version too but that is unimportant to me.
It is a text mode "Dual_VU.sh" meter.
It actually calls dash as the interpreter but change the shebang to suit yourselves.
It uses the bell character for overload per channel and... (1 Reply)
Discussion started by: wisecracker
1 Replies
LEARN ABOUT REDHAT
restorefont
restorefont(1) Svgalib User Manual restorefont(1)
NAME
restorefont - save or restore the SVGA font for textmode.
SYNOPSIS
restorefont {-r|-w} filename
DESCRIPTION
The font used by SVGA when in textmode is written to or restored from filename using the vga_gettextfont(3) and vga_puttextfont(3) func-
tions.
FILE FORMAT
The VGA font file filename has the following format:
Offset:
0 - 31 Character 0
... ...
8164 - 8195 Character 255
Each row of a character bitmap is stored as a byte (8 pixels). The space that is left from the 32-byte buffer for each character is
ignored, e.g. a 16 line font uses only offsets 0 - 15 of each character.
Linux textmode screen resolutions:
80x25 16 line font 400 scanlines
80x28 14 line font 400 scanlines
80x50 8 line font 400 scanlines
The font sizes and resolutions of extended textmodes depend on the video card type and BIOS:
132x25 14 line font 350 scanlines (ugly)
132x25 16 line font 400 scanlines
132x43 8 line font 350 scanlines (use fix132x43 to fix/improve)
132x50 8 line font 400 scanlines
Using a font that has less lines per character than the textmode works, but the characters are smaller. Using a font that is bigger than
the textmode font results in the bottom part of characters being cut off.
The svgalib distribution contains sample fonts with 8, 14 and 16 line characters in the files utils/font8, utils/font14, and utils/font16.
The convfont (1) program can be used to convert fonts straightforwardly stored character-after-character (i.e. each character only uses
8/14/whatever bytes), to the 32-byte per character format that restorefont requires.
The purpose of this program is usually to recover from a crashed console due to an svgalib, Xfree or other program bug. First save the
state of the SVGA card when on a text console. After the crash restore this state. The savetextmode(1) and textmode(1) script makes this
procedure very easy.
The national/fontpak packages, which include kernel patches, allow different textmode fonts to be used in different virtual consoles. These
have been superseded by the kbd package (in the kernel since ages). See the setfont(8) utility of the kbd package as a starting point.
Recent kernels support up to 2 fonts with 512 chars each. Recent versions of svgalib take this into account and extend the size of the
datafile accordingly.
OPTIONS
-w filename
write the font to the file filename.
-r filename
restore the font from the file filename.
SEE ALSO
svgalib(7), vgagl(7), libvga.config(5), setfont(8), vga_gettextfont(3), vga_puttextfont(3), dumpreg(1), convfont(1), fix132x43(1), restore-
textmode(1), restorepalette(1), runx(1), savetextmode(1), setmclk(1), textmode(1).
AUTHOR
This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The exact source of the referenced utility as well as of the
original documentation is unknown.
It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.
Occasionally this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or corrections
to this first version of the svgalib manual.
Svgalib (>= 1.2.11) 2 Aug 1997 restorefont(1)